Patent GB-191423390-A (GB)
Title: Lifting and Turning Jack for Mechanical or other Forms of Vehicles.
Inventor: CLEATHERO THOMAS HENRY
IPC: B60S9/18
Filed: 1914-12-02
Granted: 1915-12-02
Abstract: 23,390. Cleathero, T. H., and Spurr, F. Dec. 2. [Cognate Application, 9691/15.] Jacks.-Screw-and-nut lifting-jacks secured to or forming part of a motor - vehicle carry wheels at their lower ends which engage the ground, lifting and propulsion of the wheels being effected by the motor. In the construction shown in Figs. 3 and 4, adapted to be incorporated in a new vehicle, the jack is permanently secured to the vehicle side frames d and is braced by a bracket f<5> and crossmembers d<1>. The jack is operated from a shaft e driven by the motor so as to raise or lower the wheels i or rotate them in either direction, the screw being held against rotation during the lifting or lowering periods and then rotated for the purpose of driving the wheels. A casing f<1> carries bearings for a worm-wheel e<8> and a worm on the shaft e. The worm-wheel is free to rotate outside a sleeve e<4>, which is secured on its interior to engage a screwed shaft g carrying at its lower end a bevel-pinion g<1> and projecting upwards into a casing f<3>. The rollers i are fixed to a shaft i<1> carried in a fork h, loosely mounted on the shaft g and prevented from rotating by a lug h' which engages the bracket f'. One way toothed clutches or ratchets formed on the ends of the sleeve e<4> engage respectively, when required, with similar clutches on the fork h and on a sleeve j keyed to, but slidable on, the sleeve e<4>. The clutch member g<2> at the top of the shaft g is formed with upper and lower ratchet clutch surface adapted to engage a non - rotatable clutch disk k and the clutch surface on the top of the sleeve e<4>. The sleeve j can be turned up and down by a bell-crank lever j<2> and handlever j<3>. The shaft g may rotate freely when in its top or bottom position, but while it is being raised or lowered, a lug g<4> engages a key f<6> on the casing f<3> and prevents rotation. When it is desired to lower the shaft g and wheels i into operative position, the shaft e is rotated and turns the worm-wheels e'. The clutch disk k engages the clutch member g<4> and prevents rotation of the shaft g which is therefore moved longitudinally downwards, together with the fork h and the rollers i. Before the clutch h is disengaged, the lug g<4> engages the feather f<6> and prevents rotation until the shaft g reaches its lowest position, whereupon the clutch member g<2> engages the clutch on the upper end of the sleeve e<4>, and the shaft g therefore rotates with the worm-wheel. The rollers i are then rotated through the bevel-gear g<1>, i<1>. If the rollers are to be driven in the reverse direction, the sleeve j is raised so that its feather key engages and locks into a corresponding notch on the clutch member g<2>. When raising the shaft g, the shaft e is driven in the reverse direction with the sleeve in its lowest position. The non-rotation of the shaft g under these conditions permits it to move upwardly until the lug g<4> engages the key f<6>. When the shaft has reached its highest position, the lug g<4> clears the key f<6>, and the shaft is then rotated with the wormwheel by reason of the engagement of the clutch members g<3>, e<6> on the lower ends of the shaft g and the sleeve e<4>. In a modification, applied to an existing chassis, a reversing-gear is combined with the jack so as to avoid operating the lifting-gear through the ordinary transmission.